<template>
    <div class="app-container">  
        <mt-header fixed title="黑马程序员VUE项目">
            <span slot="left" @click="goBack" v-show="flag">
               <mt-button icon="back">back</mt-button>
            </span>
        </mt-header>
		<transition>
        	<router-view></router-view>
		</transition>
		<!-- tabbar区域 -->
        <nav class="mui-bar mui-bar-tab">
			<router-link class="my-tab-item" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="my-tab-item" to="/member">
				<span class="mui-icon  mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="my-tab-item" to="/shopcart">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span class="mui-badge" id='badge'>{{totalcount}}</span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="my-tab-item" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
    </div>
</template>


 
<script>
import {mapGetters} from 'vuex'
export default {
  data() {
    return {
      flag: true// 默认显示返回按钮
    };
  },
  methods: {
    goBack() {
      // 点击返回按钮，向后跳转
      this.$router.go(-1);
      console.log(this);
    }
  },
  created() {
    if (this.$route.path === "/home") {
      this.flag = false;
    } else {
      this.flag = true;
    }
  },
  watch: {
    // 当页面刷新的时候，不会触发 watch 中监听的 路由地址的变化
    "$route.path": function(newVal, oldVal) {
      if (newVal === "/home") {
        this.flag = false;
      } else {
        this.flag = true;
      }
    }
  },
  computed: {
    ...mapGetters(["totalcount"])
  },

  
  
};
</script>

//这里写的样式，要符合scss语法，并且样式时组件私有的，子组件不能使用
<style lang="scss" scoped>
.app-container{
    padding-top:40px ;
	padding-bottom: 50px;
	// 当有组件切换的时候，页面的宽度会变成正常宽度的2倍，此时需要隐藏超出屏幕宽度的区域
	overflow: hidden;
}
// 动画效果相关的类样式
.v-enter{
	opacity: 0;
	// 让即将进入的页面，向右偏移100%屏幕的亮度
	transform: translateX(100%);
}
.v-leave-to{
	opacity: 0;
	// 让页面从左边出去
	transform: translateX(-100%);
	position: absolute;
}
.v-enter-active,
.v-leave-active{
	transition: all 0.4s ease;
}
.mint-header{
	z-index: 99;

}
.mui-bar-tab .my-tab-item.mui-active {
    color: #007aff;
}
.mui-bar-tab .my-tab-item {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}
.mui-bar-tab .my-tab-item .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}
.mui-bar-tab .my-tab-item .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}

</style>